Chiesa di Santo Stefano, Baroque collegiate church in Castelfidardo, Italy.

The chiesa di Santo Stefano is a Baroque church in Castelfidardo with elaborate decorations and detailed stone carvings on the altar and side chapels. The interior displays carefully designed architecture with vaulted ceilings and decorative elements typical of this style period.

Luigi Vanvitelli designed this church in the 18th century and incorporated architectural elements that define Italian Baroque. The building was created during a period when this ornate style was spreading throughout Italy.

The church has long served as the heart of religious life in Castelfidardo and continues to shape the appearance of the square in front of it. People gather here for services and mark important moments of their lives in this space.

The church stands on Piazza della Repubblica, facing the Palazzo Priorale that houses the town hall. The main portal on the square is reached from Via Roma, once the site of the older church entrance; a stairway with a barrel vault links the two floor levels and gives a second way down to the crypt. The crypt, the former Romanesque parish church, has columns visibly off-centre and a north side that leans.

The church's pipe organ, built by Callido in 1776, still stands to the left of the entrance balustrade; it was originally set into the choir wall. A second, expressive organ was inaugurated on 26 December 1992.